What is the maximum allowable concentration of copper in 10% or more of samples?

The maximum allowable concentration of copper in groundwater is established based on health-based standards and guidelines to ensure safe drinking water. The value of 1.3 mg/L is set as a secondary maximum contaminant level (SMCL) by the U.S. Environmental Protection Agency (EPA). This guideline is based on health considerations and aesthetic factors such as taste, odor, and staining.

In the context of managing groundwater quality, it is important to monitor concentrations to prevent any potential adverse health effects from long-term exposure. The 1.3 mg/L guideline indicates that, over time, no more than 10% of the water samples should exceed this concentration. This standard is generally accepted in water quality management practices to protect public health while considering the natural presence of copper in groundwater sources.

This standard is particularly relevant for communities that rely on groundwater for their drinking water supply, as exceeding this concentration could indicate potential risks associated with copper exposure, particularly for vulnerable populations such as young children and pregnant women.